/* ============================================================
   星云智核工作室 · 宣传官网统一设计系统
   品牌色：深蓝 #0a2d5c / 亮蓝 #1a6fd4 / 金 #ffb020
   ============================================================ */
:root{
  --ink:#0a2d5c;
  --blue:#1a6fd4;
  --blue-d:#15539f;
  --gold:#ffb020;
  --gold-d:#e8940a;
  --soft:#f4f8ff;
  --soft2:#eef4fc;
  --line:#e6ecf5;
  --mute:#64748b;
  --text:#1f2a3d;
  --text-2:#475569;
  --white:#fff;
  --radius:16px;
  --shadow:0 14px 40px rgba(10,45,92,.10);
  --shadow-sm:0 6px 20px rgba(10,45,92,.08);
  --maxw:1180px;
  --nav-h:66px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei","Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  color:var(--text);background:var(--white);line-height:1.7;-webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
.container{max-width:var(--maxw);margin:0 auto;padding:0 22px}
.accent{color:var(--blue)}
.gold{color:var(--gold)}

/* ---------- 导航 ---------- */
.nav{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.86);
  backdrop-filter:saturate(150%) blur(12px);border-bottom:1px solid var(--line);transition:.25s}
.nav.scrolled{box-shadow:var(--shadow-sm)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:var(--nav-h)}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:18px;color:var(--ink)}
.brand-logo{height:34px;width:auto;border-radius:8px}
.brand small{display:block;font-size:11px;font-weight:500;color:var(--mute);letter-spacing:.5px}
.nav-links{display:flex;gap:28px;align-items:center}
.nav-links a{font-size:15px;color:var(--text-2);font-weight:600;position:relative;padding:6px 0;transition:.2s}
.nav-links a:hover{color:var(--blue)}
.nav-links a.active{color:var(--blue)}
.nav-links a.active::after{content:"";position:absolute;left:0;right:0;bottom:-2px;height:3px;border-radius:3px;background:var(--blue)}
.nav-cta{display:flex;align-items:center;gap:12px}
.nav-toggle{display:none;background:none;border:0;cursor:pointer;width:40px;height:40px}
.nav-toggle span,.nav-toggle span::before,.nav-toggle span::after{content:"";display:block;width:22px;height:2px;background:var(--ink);margin:5px auto;border-radius:2px;transition:.25s}
.nav-toggle span::before{margin-top:-7px}.nav-toggle span::after{margin-top:12px}

/* ---------- 按钮 ---------- */
.btn{display:inline-flex;align-items:center;gap:8px;padding:13px 26px;border-radius:999px;font-weight:700;font-size:15px;cursor:pointer;border:0;transition:.2s;white-space:nowrap}
.btn-gold{background:var(--gold);color:#2a1c00;box-shadow:0 10px 24px rgba(255,176,32,.30)}
.btn-gold:hover{background:#ffbe3d;transform:translateY(-2px)}
.btn-blue{background:var(--blue);color:#fff;box-shadow:0 10px 24px rgba(26,111,212,.28)}
.btn-blue:hover{background:var(--blue-d);transform:translateY(-2px)}
.btn-ghost{background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.35);color:#fff}
.btn-ghost:hover{background:rgba(255,255,255,.16)}
.btn-outline{background:#fff;border:1.5px solid var(--line);color:var(--ink)}
.btn-outline:hover{border-color:var(--blue);color:var(--blue)}

/* ---------- Hero ---------- */
.hero{position:relative;overflow:hidden;
  background:linear-gradient(160deg,#071f3f 0%,#0a2d5c 46%,#15539f 100%);color:#fff;
  padding:96px 0 84px}
.hero::before{content:"";position:absolute;inset:0;
  background:radial-gradient(circle at 18% 22%,rgba(63,163,232,.22),transparent 55%),
             radial-gradient(circle at 84% 80%,rgba(255,176,32,.12),transparent 52%)}
.hero::after{content:"";position:absolute;inset:0;opacity:.45;
  background-image:radial-gradient(rgba(255,255,255,.14) 1px,transparent 1px);background-size:34px 34px;
  -webkit-mask-image:linear-gradient(180deg,rgba(0,0,0,.9),transparent 80%);
  mask-image:linear-gradient(180deg,rgba(0,0,0,.9),transparent 80%)}
.hero .container{position:relative;z-index:2}
.hero-badge{display:inline-flex;align-items:center;gap:9px;padding:7px 18px;border-radius:999px;
  background:rgba(255,255,255,.10);border:1px solid rgba(255,255,255,.22);font-size:13px;font-weight:600}
.hero-badge .dot{width:7px;height:7px;border-radius:50%;background:#5fe3a1;box-shadow:0 0 10px rgba(95,227,161,.8)}
.hero h1{margin:24px 0 0;font-size:clamp(32px,5vw,56px);font-weight:800;line-height:1.16;letter-spacing:-.5px}
.hero h1 em{font-style:normal;background:linear-gradient(100deg,#8fd0ff,#ffd27a);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero-lead{margin:22px auto 0;max-width:720px;font-size:clamp(15px,1.5vw,18px);line-height:1.85;color:rgba(255,255,255,.82)}
.hero-actions{margin-top:36px;display:flex;flex-wrap:wrap;gap:14px}
.hero-tags{margin-top:30px;display:flex;flex-wrap:wrap;gap:10px;justify-content:center}
.hero-tags span{padding:6px 14px;border-radius:999px;background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.18);font-size:13px;color:rgba(255,255,255,.85)}

/* Hero 指标条 */
.hp-metrics{margin:54px auto 0;max-width:880px;display:grid;grid-template-columns:repeat(4,1fr);
  border-radius:16px;overflow:hidden;border:1px solid rgba(255,255,255,.16);background:rgba(255,255,255,.06)}
.hp-metrics div{padding:20px 12px;text-align:center}
.hp-metrics div+div{border-left:1px solid rgba(255,255,255,.14)}
.hp-metrics b{display:block;font-size:26px;font-weight:800;line-height:1.2}
.hp-metrics span{font-size:12.5px;color:rgba(255,255,255,.68)}

/* ---------- 通用区块 ---------- */
.section{padding:80px 0}
.section.alt{background:var(--soft)}
.section-head{max-width:760px;margin:0 auto 46px;text-align:center}
.eyebrow{display:inline-block;font-size:12.5px;font-weight:700;letter-spacing:2px;color:var(--blue);text-transform:uppercase;margin-bottom:12px}
.section-title{margin:0;font-size:clamp(24px,3vw,34px);font-weight:800;color:var(--ink);line-height:1.3;letter-spacing:-.3px}
.section-sub{margin:14px 0 0;font-size:15.5px;line-height:1.8;color:var(--mute)}

/* ---------- 网格 / 卡片 ---------- */
.grid{display:grid;gap:22px}
.grid-2{grid-template-columns:repeat(2,1fr)}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:28px;box-shadow:var(--shadow-sm);transition:.22s}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-color:#cfe0f5}
.card-icon{width:52px;height:52px;border-radius:14px;background:var(--soft2);display:flex;align-items:center;justify-content:center;font-size:26px;margin-bottom:16px}
.card h3{font-size:18.5px;color:var(--ink);margin-bottom:8px}
.card p{color:var(--text-2);font-size:14.5px}
.more{display:inline-block;margin-top:14px;color:var(--blue);font-weight:700;font-size:14px}
.cred-list{list-style:none;margin:0;padding:0}
.cred-item{display:flex;gap:12px;padding:10px 0;border-bottom:1px dashed var(--line);font-size:15px;color:var(--text-2)}
.cred-item:last-child{border-bottom:0}
.cred-dot{flex:0 0 9px;height:9px;width:9px;border-radius:50%;background:var(--gold);margin-top:8px}
.cred-text{color:var(--text-2)}

/* ---------- 平台 / 频道卡片 ---------- */
.platform-grid{gap:22px}
.platform-card{display:flex;flex-direction:column;background:#fff;border:1px solid var(--line);border-radius:20px;padding:30px;box-shadow:var(--shadow-sm);transition:.22s;position:relative;overflow:hidden}
.platform-card::before{content:"";position:absolute;top:0;left:0;right:0;height:5px;background:linear-gradient(90deg,var(--blue),var(--gold))}
.platform-card:hover{transform:translateY(-5px);box-shadow:var(--shadow)}
.pc-stage{font-size:12.5px;font-weight:700;letter-spacing:1px;color:var(--blue);text-transform:uppercase}
.pc-icon{font-size:38px;margin:14px 0 10px}
.platform-card h3{font-size:20px;color:var(--ink);margin-bottom:6px}
.pc-audience{font-size:13.5px;color:var(--mute);font-weight:600}
.pc-desc{margin-top:12px;color:var(--text-2);font-size:14.5px;flex:1}
.pc-need{margin-top:14px;font-size:13.5px;color:var(--text-2);background:var(--soft);border-radius:10px;padding:10px 12px}
.pc-need b{color:var(--blue)}

/* ---------- 步骤 ---------- */
.steps{display:grid;gap:18px;grid-template-columns:repeat(4,1fr)}
.step{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow-sm);position:relative}
.step h4{font-size:17px;color:var(--ink);margin-bottom:8px}
.step p{font-size:14px;color:var(--text-2)}
.step-tag{display:inline-block;font-size:12px;font-weight:700;color:var(--blue);background:var(--soft2);padding:3px 10px;border-radius:999px;margin-bottom:10px}
.step-goal{margin-top:12px;font-size:12.5px;color:var(--mute);border-top:1px dashed var(--line);padding-top:10px}
.steps-3{grid-template-columns:repeat(3,1fr)}

/* ---------- 标签筛选 ---------- */
.tabs{display:flex;flex-wrap:wrap;gap:10px;justify-content:center;margin-bottom:30px}
.tab{padding:9px 20px;border-radius:999px;background:#fff;border:1px solid var(--line);font-weight:600;font-size:14px;color:var(--text-2);cursor:pointer;transition:.2s}
.tab:hover{border-color:var(--blue);color:var(--blue)}
.tab.active{background:var(--blue);color:#fff;border-color:var(--blue)}

/* ---------- 案例卡片 ---------- */
.case-card{display:flex;flex-direction:column}
.case-tags{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:12px}
.case-tags span{font-size:12px;font-weight:600;color:var(--blue);background:var(--soft2);padding:3px 10px;border-radius:999px}
.case-card h3{font-size:17.5px;color:var(--ink);margin-bottom:6px}
.case-card .sub{font-size:13px;color:var(--gold-d);font-weight:600;margin-bottom:8px}
.case-card p{font-size:14px;color:var(--text-2)}

/* ---------- 工作室介绍网格 ---------- */
.about-grid{display:grid;grid-template-columns:280px 1fr;gap:44px;align-items:center}
.avatar{width:200px;height:200px;border-radius:28px;background:linear-gradient(150deg,var(--blue),var(--ink));display:flex;align-items:center;justify-content:center;font-size:90px;box-shadow:var(--shadow);margin:0 auto}
.quote-card{background:linear-gradient(150deg,#0a2d5c,#15539f);color:#fff;border-radius:22px;padding:46px;position:relative;box-shadow:var(--shadow)}
.quote-card .mark{position:absolute;top:18px;left:28px;font-size:90px;line-height:1;color:rgba(255,255,255,.18);font-family:Georgia,serif}
.quote-card p{font-size:18px;line-height:1.95;position:relative;z-index:2}
.quote-card .author{margin-top:18px;font-weight:700;color:var(--gold)}

/* ---------- CTA 横幅 ---------- */
.cta-band{background:linear-gradient(150deg,#0a2d5c,#15539f);color:#fff;border-radius:22px;padding:54px 40px;text-align:center;box-shadow:var(--shadow)}
.cta-band h2{font-size:clamp(22px,2.6vw,30px);font-weight:800;margin-bottom:12px}
.cta-band p{color:rgba(255,255,255,.82);max-width:620px;margin:0 auto 26px;font-size:15.5px}

/* ---------- 页脚 ---------- */
.footer{background:#071f3f;color:rgba(255,255,255,.78);padding:60px 0 28px;margin-top:20px}
.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:30px}
.footer .brand{color:#fff}
.footer .brand small{color:rgba(255,255,255,.6)}
.brand-blurb{margin-top:14px;font-size:14px;line-height:1.8;color:rgba(255,255,255,.62);max-width:320px}
.footer h5{color:#fff;font-size:15px;margin-bottom:16px}
.footer a{display:block;font-size:14px;color:rgba(255,255,255,.7);padding:6px 0;transition:.2s}
.footer a:hover{color:var(--gold)}
.footer-bottom{border-top:1px solid rgba(255,255,255,.12);margin-top:40px;padding-top:22px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;font-size:13px;color:rgba(255,255,255,.55)}

/* ---------- 联系 ---------- */
.contact-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:36px;align-items:start}
.contact-card{background:#fff;border:1px solid var(--line);border-radius:20px;padding:34px;box-shadow:var(--shadow-sm)}
.contact-card h2{font-size:24px;font-weight:800;color:var(--ink)}
.field{margin-bottom:16px}
.field label{display:block;font-size:13.5px;font-weight:600;color:var(--text-2);margin-bottom:7px}
.field input,.field select,.field textarea{width:100%;padding:12px 14px;border:1.5px solid var(--line);border-radius:11px;font-size:15px;font-family:inherit;color:var(--text);background:#fff;transition:.2s}
.field input:focus,.field select:focus,.field textarea:focus{outline:none;border-color:var(--blue);box-shadow:0 0 0 3px rgba(26,111,212,.12)}
.field textarea{resize:vertical;min-height:96px}
.contact-info{background:var(--soft);border-radius:18px;padding:24px}
.info-row{display:flex;gap:14px;align-items:flex-start;padding:12px 0;border-bottom:1px dashed var(--line)}
.info-row:last-child{border-bottom:0}
.info-row .ico{font-size:22px;flex:0 0 auto}
.info-row .k{font-weight:700;color:var(--ink);font-size:14.5px}
.info-row .v{font-size:14px;color:var(--text-2)}
.qr-box{background:#fff;border:1px solid var(--line);border-radius:16px;padding:18px;text-align:center}
.qr-box .qr{width:150px;height:150px;margin:0 auto 10px;border-radius:10px;background:#fff url("../img/wechat-qr.jpg") center/cover no-repeat;box-shadow:var(--shadow-sm)}
.qr-box p{font-size:13px;color:var(--mute)}

/* ---------- 滚动揭示 ---------- */
.reveal{opacity:0;transform:translateY(24px);transition:.6s cubic-bezier(.2,.7,.2,1)}
.reveal.in{opacity:1;transform:none}

/* ---------- 响应式 ---------- */
@media(max-width:960px){
  .grid-4{grid-template-columns:repeat(2,1fr)}
  .grid-3{grid-template-columns:repeat(2,1fr)}
  .steps,.steps-3{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1fr 1fr}
  .about-grid{grid-template-columns:1fr;text-align:center}
  .contact-grid{grid-template-columns:1fr}
}
@media(max-width:640px){
  .nav-links{position:absolute;top:var(--nav-h);left:0;right:0;background:#fff;flex-direction:column;gap:0;
    padding:10px 22px 18px;border-bottom:1px solid var(--line);box-shadow:var(--shadow);display:none}
  .nav.open .nav-links{display:flex}
  .nav-links a{padding:12px 0;border-bottom:1px solid var(--line);width:100%}
  .nav-links a.active::after{display:none}
  .nav-toggle{display:block}
  .grid-2,.grid-3,.grid-4{grid-template-columns:1fr}
  .steps,.steps-3{grid-template-columns:1fr}
  .hp-metrics{grid-template-columns:repeat(2,1fr)}
  .hp-metrics div:nth-child(3){border-left:none;border-top:1px solid rgba(255,255,255,.14)}
  .hp-metrics div:nth-child(4){border-top:1px solid rgba(255,255,255,.14)}
  .footer-grid{grid-template-columns:1fr}
  .hero{padding:74px 0 60px}
  .section{padding:58px 0}
  .cta-band{padding:40px 24px}
}